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Forums » General Discussion » Technical Questions » Preout voltage vs amplifier input sensitivity?
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#409577 - 01/18/15 02:03 PM
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![]() connoisseur ![]() Registered: 03/28/14 Posts: 1565 Loc: PEI, Canada |
I have an AVR capable of max preout voltage of 6v rms. Nominal is stated as 1v rms. It will be connected to 3 external amplifier channels with an input sensitivity of 311mv for max output. They will be used for the left/center/right speakers. The AVR will handle the rest of the channels in the surround system.
Is the great difference between ouput voltage vs input sensitivity going to cause volume/trim issues between the onboard vs external powered speakers? I dont want to run the L/C/R preouts at -10 to match the onboard amplification. Am I screwed up at how I'm thinking of this? ![]()
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Trevor. Cold turkey. Thanks guys. Cheers. |
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#409579 - 01/18/15 02:27 PM
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![]() connoisseur ![]() Registered: 07/12/09 Posts: 2204 Loc: Whitehorse YT |
I found This to be easy to understand for a simple explanation. I read the article back when I was buying my first home amp. Car amps have variable input gain so I had to study up a bit.
Edited by Socketman (01/18/15 02:28 PM)
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DOG is GOD spelled backwards. What others think of me is none of my business. M80 V3 MY GLOSS Cherry |
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#409581 - 01/18/15 02:59 PM
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![]() connoisseur ![]() Registered: 03/28/14 Posts: 1565 Loc: PEI, Canada |
Thanks for the link!
Ok, I see the formula used equates to a voltage gain of 35.49 for the external amps. Seems really high. The manual states a max dc offset of 15mv. Whatever that means. 148w into 8 ohms. 285 into 4 ohms. From .311v input. Crazy. According to the article this setup might be on the verge of too much of a good thing. I may be approaching my AVR preamp noise floor to make the external amp work out. How does anyone elses setup compare? Edited by Serenity_Now (01/18/15 03:03 PM)
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Trevor. Cold turkey. Thanks guys. Cheers. |
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#409583 - 01/18/15 03:19 PM
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![]() connoisseur ![]() Registered: 07/12/09 Posts: 2204 Loc: Whitehorse YT |
Yes that is quite high and may cause the preamp to introduce noise into the signal, especially with very sensitive speakers.
Another good read. Edited by Socketman (01/18/15 03:21 PM)
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DOG is GOD spelled backwards. What others think of me is none of my business. M80 V3 MY GLOSS Cherry |
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#409592 - 01/18/15 06:20 PM
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![]() connoisseur ![]() Registered: 03/28/14 Posts: 1565 Loc: PEI, Canada |
Ok, I'm not so concerned now after the 2nd article. Seems the nominal 1V output is perfectly fine for the input sensitivity. I just got hung up on the 6v max figure. That must be with the trim level at +10 or so. In any case, I wont know until I try.
Thanks for the info. ![]()
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Trevor. Cold turkey. Thanks guys. Cheers. |
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#409604 - 01/18/15 10:24 PM
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![]() axiomite ![]() Registered: 12/06/07 Posts: 7786 Loc: Canada |
Originally Posted By: Serenity_Now ... In any case, I wont know until I try. Thanks for the info. ![]() Hey, at least you know you don't need to turn it up to 11 to blow the roof off. ![]()
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#409617 - 01/19/15 10:26 AM
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![]() connoisseur ![]() Registered: 07/12/09 Posts: 2204 Loc: Whitehorse YT |
Let us know how it goes. Hopefully they will maintain an equal volume level as things get turned up.
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DOG is GOD spelled backwards. What others think of me is none of my business. M80 V3 MY GLOSS Cherry |
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